package com.swift;

import java.util.Random;
import java.util.Scanner;

public class GuessBigSmall {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
        Random random = new Random();
        int number = random.nextInt(1000) + 1;
        for (;;) {
            System.out.println(
 
"請輸入猜的——正整數——數字：");
            int guessNumber=scan.nextInt();
            if (guessNumber>number) {
                System.out.println("猜大了。");
                continue;
            } else if (guessNumber<number) {
                System.out.println("猜小了。");
                continue;
            } 
 
else {
                System.out.println("恭喜，猜對了。");
                break;
            } 
        }
    }
}

另一種生成隨機數方法

package com.swift;

import java.util.Scanner;

public class GuessBigSmall2 {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        
 
int number = (int) (Math.random() * 1000 + 1);
        for (;;) {
            System.out.println("請輸入猜的——正整數——數字：");
            int guessNumber = scan.nextInt();
            if (guessNumber > number) {
                System.out.println("猜大了。");
                continue;
            } else if (guessNumber < number) {
                System.out.println("猜小了。");
                continue;
            } else {
                System.out.println("恭喜，猜對了。");
                break;
            }
        }
    }
}

java 實現猜數字遊戲 隨機給定一個數字，猜大小直到正確